10.14489/td.2015.010.pp.043-052

2015, 10 October

DOI: 10.14489/td.2015.010.pp.043-052

Komarov V.A.
THE FORMATION OF THE SHEAR WAVES FIELD GENERATED BY ELECTROMAGNETIC MEANDER-LINE EMITTERS
(pp. 43-52)

Abstract. It is presented the calculation of the projections of elastic displacements generated in a halfspace of a solid conducting body owing to the electromagnetic transformation mechanisms (EMAT). The derived formulas are used to model the shear acoustic field of the attachable meanderline emitters (grates). It is shown that the main peak of the acoustic field is caused by the summation of the oscillations in the same phase generated with all sections of the grate. The magnitude of the peak increases with the number of the grate conductors due to the additional number of elastic oscillations which are summed in the phase. The magnitude of the coefficients adjusting the current density in the sections of the grate is determined by a number of the conductors in it, but it does not depend on its step. The oscillations propagation angle with the corrected field does not depend on the parity of a number of the grate conductors. The differences in the oscillation directions in all the areas of emission are eliminated with compensation of the additional peaks (in the far field zone). The emission is directed under the same angle.

Keywords: EMA transformation, meanderline emitters, modeling of the shear acoustic field.

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B. A. Komarov
Physical-Technical Institute of the Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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